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A confuse about save resource [message #1790001]

Sat, 02 June 2018 03:57

Eclipse User

Hi,

I found that, when i save a resource in Sirius, it save twice actually. The first time is at ResourceSaveDiagnose.hasDifferentSerialization function, it save resource to a temp file. The second time is the real save. This mechanism brings performance problem when resource is large.

My question is: what is the purpose of this mechanism, is it necessary?

Re: A confuse about save resource [message #1790118 is a reply to message #1790001]

Tue, 05 June 2018 08:49

Eclipse User

Hi,

It is a very complicated, costly job to know what resources are impacted by a change from a diagram editor.
Verifying the serialized content in a temp file with the old resource content is the way to know if a resource should be saved because a change has impacted the tested resource.

We could save all the time all the resources and avoid this verification. But this is not acceptable because some users may exploit resource change information. I.e last modified date.

Indeed, saving all the time means you cannot know when the file has been effectively changed because this information will change wether there are effective changes or not.
For example, the history view in Eclipse for a resource will have as many entries as user saves. So you cannot use this view easily to know if a real change has been done or to find differences with older version.

Regards,

Pierre

Re: A confuse about save resource [message #1790120 is a reply to message #1790118]

Tue, 05 June 2018 09:01

Eclipse User

Hi

EMF has smart "save via memory buffer"/"don't save if unchanged" facilities. Are you sure that these are being used appropriately? Are you sure that save options are stable and so avoiding spurious changes?

Regards

Ed Willink

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